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Crack propagation analysis: verification of a new software
1998 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

An issue of utmost concern, in the design of aircraft components, is to predict the life time before failure. It is superfluous to make clear that failure in these components have often catastophic and extremely expensive consequences. In order to detect the critical life time of a component, adaptable software is applied to perform crack initation- and propagation analysis. This project consider the propagation part of the fracture process. AFGROW, a fracture mechanics software for simulating crack growth, is verified as a part of the thesis. Computations are accomplished on various alloys and compared with physical fatigue experiments as well as with previous computations in NASCRAC. The evaluation shows satisfactory results for the analysis that are based on and compared with the physical tests. The calculations that are based on previous analysis in NASARC show acceptable results. AFGROW is, since it is based on menu driven functions, user-friendly and it is based on the traditional crack growth relationships which makes the software reliable. AFGROW is recommended, as a result of this thesis, for crack propagation analysis in various situations. The software is extremely useful when an approximative answer is required.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Crack propagation, Fatigue, NASCRAC, AFGROW, da/dN-curves, Lagrange interpolation, Life Prediction
Keyword [sv]
URN: urn:nbn:se:ltu:diva-48070ISRN: LTU-EX--98/328--SELocal ID: 58c296ca-6673-462e-abad-f779892d7704OAI: diva2:1021408
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering programmes 1997-2000, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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